Global Patent Index - EP 0731185 B1

EP 0731185 B1 2000-01-19 - Alumium-copper-magnesium alloy sheets with low residual stresses

Title (en)

Alumium-copper-magnesium alloy sheets with low residual stresses

Title (de)

Aluminium-Kupfer-Magnesiumbleche mit niedrigen Restspannungen

Title (fr)

Tôles en alliage Al-Cu-Mg à faible niveau de contraintes résiduelles

Publication

EP 0731185 B1 (FR)

Application

EP 96420077 A

Priority

FR 9503159 A

Abstract (en)

[origin: EP0731185A1] An alloy comprises mainly Al with 3.5-5 wt.% Cu, 1.0-2.0% Mg, 0-0.25% Si, 0-0.025% Fe, 0-0.55% Mn and less than 0.25% total of other elements. The value of Mn-2Fe is between 0 and 0.2%. The level of recrystallisation in a piece of the alloy is more than 50% throughout, with no more than 35% variation between the surface and the centre. A bar of alloy which has been tempered and stretched, possibly annealed, then machined to half its thickness and placed on two spaced supports show a degree of bending given by F.E. is less than 0.14L<2>, pref. less than 0.04L<2>, where F is the bend in microns, E is the bar thickness in mm, and L the support spacing in mm.

IPC 1-7

C22C 21/16

IPC 8 full level

C22C 21/16 (2006.01)

CPC

C22C 21/16 (2013.01)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family

EP 0731185 A1 19960911; EP 0731185 B1 20000119; DE 69606208 D1 20000224; DE 69606208 T2 20000621; FR 2731440 A1 19960913; FR 2731440 B1 19970418